Projective platforms gluing for ATLAS chambers
1.
one page procedure for the gluing
2.
Required tools and material
3.
the projective template and the projective platform
4.
procedure steps
5.
control of the gluing
J.-Ch. Barrière, V. Gautard, P. Ponsot, Y. Reinert, Ph. Schune
for the Saclay muon hardware group
CEA Saclay
DAPNIA
91191 Gif sur Yvette cedex
France
In case of problems/difficulties with projective tools, please contact us:
Jean-Christophe Barrière:(33) 1-69-08-68-54 email: barriere@dapnia.cea.fr
Valérie Gautard: (33) 1-69-08-45-96,
email: vgautard@cea.fr
Claude Guyot:
(33) 1-69-08-55-74,
email: guyot@hep.saclay.cea.fr
Patrick Ponsot:
(33) 1-69-08-79-30,
email: ponsot@dapnia.cea.fr
Philippe Schune: (33) 1-69-08-70-61,
email: schune@hep.saclay.cea.fr
Fax # (valid for all of us):(33) 1-69-08-64-28
One page information for positioning and gluing projective platforms
1) The MDT multilayer carrying the praxial
platforms is completed and positioned on
the top. The chamber is still on the granite
table
2) Remove all praxial black
boxes.
granite table
3) Fix a projective platform on each
“projective template”.
Screwing torque= 0.2 N.m max.
projective platform
(hand screwing !)
projective template
4) Put the two “praxial-projective
fork” in position in the praxial
platform, always on the
Z
RO side of the chamber.
5) Put the “X ruler” on
the tubes in contact
with the two “praxialprojective fork”.
X
praxial-projective fork
7) after a careful cleaning of the MDT
tubes AND projective platforms, put
the two glues on the tube at the
location of the projective platforms:
•
•
•
•
•
8) put the projective
template with its
projective platform in
its position (see
engineer drawing for
the correct position).
Slow glue (DP-490)
Fast glue (DP-110)
Slow glue
Fast glue
Slow glue
6) fix the “X ruler” in
position using the
screw on each
“praxial-projective
fork”.
9) check the labeling on
the ruler to be sure
that the template is
correctly positioned.
10) (not shown) put the calibrated MDT tube (already used for praxial platform positioning)
in contact with the first projective template. This is necessary in order to have a X-stop for
the second projective template, on the other side of the chamber. Before positioning the
projective platform, don’t forget to put glue after a careful cleaning, as in step 7.
2) Required tools and materials
• 2 projective templates and 2 projective platforms
• 2 praxial-projective forks
• 1 X-ruler, with chamber name
2 “control templates”
each associated with its
“common masks support”
• 2 type of glues: slow glue (DP-490) and fast glue (DP-110)
• a calibrated MDT tube (the one already used for praxial platforms
positioning, in order to have X-stop on both chamber sides
• a screwing torque to control screwing of platform on template
3) The projective template and the projective platform
Sphere on end-plugs
Hole to set the template position on
the proper tube using the X-ruler
Sphere on tubes
Flat-pin on end-plug
3 spheres
defining the
projective
platform
position.
Pin which will
be in contact
with the X-ruler
Sphere on tubes
Projective platform
Pin which will be in contact
with the calibrated tube
(already used for praxial), in
order to fix the X position of
platform position on the HV
side.
hole for
tomograph scan
4.1) Procedure steps
1)
The MDT multilayer carrying the praxial platform is just completed and
positioned on the top: The last layer of the other multilayer is on the assembly
granite table comb and ready to be glued.
2) Remove all praxial black
boxes.
3) Put each projective platform
in position on its template.
Screwing torque= 0.2 N.m
max. (hand screwing !)
4.2) Procedure steps (cont’d)
4) On the RO side of the chamber, put
SIDE VIEW
a “praxial-projective forks” on each
praxial platform. These tools are
needed in order to connect X of the
praxial platforms to X of the projective
platforms (tolerance ~ ± 200mm).
X-stop needed
for the X-ruler
Check that the 6 positioning pins on
the “fork” are in contact with the
praxial platform.
praxial platform
TOP VIEW
5)
Put the X-ruler directly on top of
the MDT tubes, in contact with the Xstop of the two “praxial-projective
forks” (on each side). Check that the
chamber name written on the X-ruler
is visible.
praxial-projective
forks
6) Fix, by hand, the X-ruler thanks to
the screw on the “praxial-projective
forks”.
The X-ruler is fixed in
its correct position
4.3) Procedure steps (cont’d)
7) Do a careful cleaning of MDT tubes where the
platforms will be glued AND on the projective
platform side to be glued.
Put the two glues (slow and fast) on top of 5
MDT tubes, where the projective platform should
be glued. This has to be done for both projective
platforms, so on each side of the chamber: RO
side where the X-ruler is and on the symmetric
position on HV side. Make sure that the glue
strips go slightly further than the platform size.
•
•
•
•
•
slow glue: DP-490,
fast glue: DP-110
Slow
Fast
Slow
Fast
Slow
4.4) Procedure steps (cont’d)
8) put the first projective
template (RO side) with its
projective platform in its
position. The MDT tubes
receiving the sphere are
given by the X-ruler (check
also on the engineering
drawing).
RO side
9) check the labeling on the
ruler to be sure that the
template is positioned on the
proper tubes.
Check also that everything
is in its correct position:
good contact between
template X-pin and X-ruler,
etc…
10) put the calibrated MDT tube (already used for praxial
platform positioning) in contact with the outside X-pin of
the RO projective template.
This tube is needed in order to have a X-stop for the
second projective template, on the other side of the
chamber (HV side). Then, put the second template with
its platform (not shown). But before positioning the
second projective platform, don’t forget to put glue
on MDT tubes after a careful cleaning, as in step 7.
Wait at least 1 hour before removing the tools.
4.5) Platforms for chambers at position z=+-1
For chambers in position 1 (close to eta=0) special positions of the
projective platforms are needed which require additional steps. The
platform carrying the projective sensors are placed far away from the endplugs. Additional platforms properly positioned w.r.t. the end-plugs are
added at the corners. These steps are describe below:
10) Glue the platforms at the low z corners (same procedure as for the
standards platforms).
11) After glue curing of the corner projective platforms (at least 1 hour),
remove the X-ruler and the two praxial-projective forks. Then, put a small
calibrated tube in contact with each previously glued projective platforms
at the corner of the chamber. This will give a X reference for these new
platforms.
Positioning tool (and platform)
in special position in the middle
of the chamber, w.r.t. corner
platform.
Here, the X-reference is
done using a small calibrated
tube, directly on contact with
the corner platform and with the
sphere on end-plug of the
template.
already glued platform
on corner of the chamber
Wait at least 1 hour before
removing the tools.
Sphere on end-plugs
5.1) Control of the gluing: hardware
When a projective platform have been glued on a MDT chamber, it is mandatory to
check if the gluing have been done correctly. The following procedure explains how to do
this important control:
1) the projective platform have been glued and the positioning tool have been
removed; the X-ruler is still in position,
2) put the “common masks support” on top of the projective platform,
3) put the “control template” equipped with 2 lens+camera in position in contact with
the X-ruler. This “control template” is the one which have the same shape than the
positioning template.
4) record the two Rasnik images. To compare these images to calibrated ones we
provide a software program which calculate the platform position w.r.t. tubes. The results is
automatically record.
(3) control template
(2) common masks support
(1) projective platform already glued
The following pictures illustrate the system when in
position, ready to record Rasnik images (H8 prototype):
control template
control template
mask
“common
masks support”
put directly on
the projective
platform
5.2) Control of the gluing: software manual
How to use the Saclay Projective Control Software:
Before to do some measurements you must fill the following fields (see also Fig. 1):
•Chamber type (1): BIL, BML or BOL
•Side (2): A or C.
•Tower (3): Chamber tower number: 1=close to the central gap; 6=at highest rapidity.
•Sector (4): ATLAS has 16 sector (e.g. 13 is in-between toroid “feet”).
•Chamber local name (5): you can give here a local name for your chamber: e.g. BOL035.
If this field is filled, you are not oblige to fill the “side” (2), the “tower” (3) and the
“sector” (4) numbers.
•Chamber side (6): HV or RO.
•Tool number (7): this number, 1 or 2, is written on each “control tool”. You must used the
same control tool number than the gluing tool number.
•Total number of correct measurements (8) and rank (9): you can use up to 3 Icaras
measurements for that control (the mean value will be taken). WARNING: the rank is
numbered starting from the end: 1=last measurement, 2=the one before the last, etc… We
provide this possibility, in case of measurement problem: e.g. you repeat 3 times the
measurements, but for the second one, the Icaras output is incorrect. Then you must fill:
“total number of correct measurement”=2 and rank= 1 (last) and 3 (first) or 3 and 1; and
last “rank number” field is ignored.
•Path and name of the input/output files (10): give the path of the Icaras file to be read
(top) and the path of the output file (bottom).
When all previous fields are filled, you can calculate the projective platform position:
•Ready for a measure (11): click on the white square to calculate projective platform position.
•Icaras raw data (12): all Icaras data that are used appear in this zone for control.
•Results (13): they are given in the chamber coordinates: x= wire axis, y=perpendicular to the
multilayer plane and z=along the X-plate. Units are mm and radian.
•Comment zone (14): “good” when gluing is correct at 1 sigma w.r.t. nominal values,
“good at 2 sigma” when gluing is correct at 2 sigma w.r.t. nominal
“bad a xxx sigma” otherwise.
Since the control and the gluing of projective platforms are performed using tools put directly
on MDT tubes, we define the following sigma: on x: 400 mm, on y and z: 30 mm; 200 mrad
for all rotations.
5.2) Control of the gluing: software manual (con’t)
SAVE (15): in order to record the data just taken, you must click on the “SAVE” box.
In the output file specified in field number (10) all useful information will be recorded:
date, chamber name, raw data from Icaras, tool number, reconstructed platform position,
etc… The output file is an ASCII file. This file could be used to fill the Chamber Data
Base on what concern projective platforms position.
QUIT (16): if you click on this box the data just taken are not recorded in the “record file”,
specified in field number (10). You exit this program.
Important remarks:
•In Icaras, the X_axis camera channel must be recorded first.
•If an -1 error message occurs, this is an unsuccessful open file, please phone us.
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Fig. 1: dialog box seen on the screen